BETA — measurements and names under active refinement. Seen a sign, a gate, or a better name? Report it (photos welcome).
Lawnt to Tir Mostyn°
9366.5 m · gain 331.2 m · overall 3.5% · Soar · Sir Ddinbych - Denbighshire
Shape: sustained — 44% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 576 m.
An unlisted find of this survey, on no list we know of. It was discovered by analysing LiDAR terrain data and cross-checked against the OS road network, surface models and map tags — but despite all that, a discovery can still be an artifact of the terrain model or the map. Treat it as a well-evidenced hypothesis until someone has ridden it. If that someone is you, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.
° The name is provisional: this climb appears on no list we know of, so it was named from nearby map places. There is no evidence of local usage — (auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (53.1336, -3.4736)'). Corrections welcome.
≈ Overhead cover (tree canopy or structures) spans 19% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain, not wrong. Longer windows average over more clean ground and are steadier.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | 43.3% | 0–2 m | |
| 3 m (diagnostic) | 32.2% | 0–3 m | |
| 5 m | 20.1% | 3117–3122 m | |
| 10 m | 19.1% | 3112–3122 m | |
| 20 m | 18.3% | 3110–3130 m | |
| 25 m | 17.9% | 3109–3134 m | |
| 50 m | 17.2% | 3013–3063 m | |
| 100 m | 16.7% | 3033–3133 m |
descends_at_end Extent detection suggests reviewing where this climb starts/ends.
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
Provenance
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"sample_interval_m": 1.0,
"interpolation": "bilinear",
"smoothing": "none",
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"diagnostic_windows_m": [
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"calculated_at": "2026-08-12T09:09:54+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
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"climb_origin": "discovered",
"notes": "Coarse pass: max 15.8% over 200 m (Terrain 50), gain 291.6 m over 8493 m way. EXTENDED by graph walk: +2 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 2 overlapping proposal(s): discovered-lane-53-1490-3-4587, discovered-lane-53-1599-3-4558 ADOPTED (notable slice 2026-08-11): big-gain. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (53.1336, -3.4736)'.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (53.1336, -3.4736)'"
}